spark ColumnDescriptor 源码
spark ColumnDescriptor 代码
文件路径：/sql/hive-thriftserver/src/main/java/org/apache/hive/service/cli/ColumnDescriptor.java
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hive.service.cli;
import org.apache.hadoop.hive.serde2.thrift.Type;
import org.apache.hive.service.rpc.thrift.TColumnDesc;
/**
* ColumnDescriptor.
*
*/
public class ColumnDescriptor {
private final String name;
private final String comment;
private final TypeDescriptor type;
// ordinal position of this column in the schema
private final int position;
public ColumnDescriptor(String name, String comment, TypeDescriptor type, int position) {
this.name = name;
this.comment = comment;
this.type = type;
this.position = position;
}
public ColumnDescriptor(TColumnDesc tColumnDesc) {
name = tColumnDesc.getColumnName();
comment = tColumnDesc.getComment();
type = new TypeDescriptor(tColumnDesc.getTypeDesc());
position = tColumnDesc.getPosition();
}
public static ColumnDescriptor newPrimitiveColumnDescriptor(String name, String comment, Type type, int position) {
// Current usage looks like it's only for metadata columns, but if that changes then
// this method may need to require a type qualifiers arguments.
return new ColumnDescriptor(name, comment, new TypeDescriptor(type), position);
}
public String getName() {
return name;
}
public String getComment() {
return comment;
}
public TypeDescriptor getTypeDescriptor() {
return type;
}
public int getOrdinalPosition() {
return position;
}
public TColumnDesc toTColumnDesc() {
TColumnDesc tColumnDesc = new TColumnDesc();
tColumnDesc.setColumnName(name);
tColumnDesc.setComment(comment);
tColumnDesc.setTypeDesc(type.toTTypeDesc());
tColumnDesc.setPosition(position);
return tColumnDesc;
}
public Type getType() {
return type.getType();
}
public boolean isPrimitive() {
return type.getType().isPrimitiveType();
}
public String getTypeName() {
return type.getTypeName();
}
}
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